Iraq wasn't in the state of unrest at the time of invasion, although yes, in principle Saddam was as murderous dictator as the other two. Arab spring would most decidedly have flared up his Iraq as well.

Venezuela crisis is not anywhere on the scale of outright war in Syria and Libya. It is also well outside the reach of feasible French force projection. France however is involved in a number of conflicts elsewhere in francophone Africa, relatively low profile as the interventions have stabilizing effect.

With Libya and Syria we also had as close to A/B test in history as we get. What if we interfere in a massacre, and what if we watch from the sidelines in exchange for deal with Iran? The answer is apparently two orders of magnitude more deaths, displacement and human suffering.